Feed Device Skew Removal via Motor Suppression Current
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Solution Overview
Problem
Existing feed devices and recording apparatuses face challenges in effectively removing skew of thick sheets due to issues like reduced roller diameter, slipperiness, and external forces, which complicate the skew removal process and increase device size and complexity.
Innovation Solution
A feed device with a controller that manages the suppression current to the first motor, ensuring the reverse transport speed of the first roller is suppressed to or less than the second roller's speed, allowing the second roller to reverse and perform skew removal without excessive first roller reversal, thereby maintaining the sheet's alignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the feed roller is prevented from reversing by providing a braking unit, then skew removal is appropriately performed on thick sheets, but the device size increases and the structure becomes complicated
Solution Approach 1:
The patent replaces the mechanical braking unit with an electrical control system. The controller manages the feed motor to generate a suppression current that prevents the feed roller from reversing during the discharging operation, eliminating the need for a separate braking mechanism while maintaining skew removal effectiveness
Solution Approach 2:
The patent changes the operational parameters of the feed motor by controlling the suppression current flow. By adjusting the electrical parameters (current magnitude and timing) rather than adding mechanical components, the system achieves reliable skew removal without increasing device complexity
2Device complexity
If the first roller is allowed to reverse during the discharging operation, then the device structure is simplified, but the skew removal is not appropriately performed due to excessive reversal
Solution Approach 1:
The patent uses electrical control of the feed motor to replace mechanical constraints. By controlling the suppression current, the system prevents excessive reversal of the feed roller during discharging, achieving reliable skew removal without adding complex mechanical braking units
Solution Approach 2:
The controller monitors the discharging operation and adjusts the suppression current to the feed motor based on the operational state. This feedback control ensures the feed roller reverses appropriately (matching the transport roller pair's reverse speed) without excessive movement, maintaining skew removal effectiveness
3Device complexity
If the feed roller reverses excessively due to external forces like hopper biasing force, then the device structure is simpler, but the reverse transport speed exceeds the second roller's speed causing skew removal failure
Solution Approach 1:
The controller continuously monitors the discharging operation and adjusts the suppression current to the feed motor in real-time. This feedback mechanism ensures that even when external forces like hopper biasing force act on the system, the feed roller's reverse speed remains synchronized with or less than the transport roller pair's reverse speed
Solution Approach 2:
The patent replaces mechanical speed control mechanisms with electrical control of the feed motor. By managing the suppression current, the system precisely controls the feed roller's reverse speed to match the transport roller pair's speed, preventing excessive reversal without adding mechanical speed control devices
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration enables effective skew removal by controlling the first roller's reversal, reducing bending and damage, and simplifying the device structure, allowing for precise sheet alignment and reduced complexity in the feed device and printer.
Implementation Method 1
the controller causes a suppression current that suppresses the reverse transport speed of the first roller to the reverse transport speed of the second roller or less to flow to the first motor
Implementation Method 2
a feed device that has a skew removing function for a sheet... performs skew removal on the sheet by reversing the transport roller pair
Data Source
AI summary
A feed device includes a feed roller, a transport roller pair provided further to the downstream side in the transport direction of a sheet than the feed roller, a first motor by which the feed roller is driven, and a second motor by which the transport roller pair is driven, and in which a controller that controls the first motor, and performs a skew removal operation accompanying reverse transport of the sheet by the transport roller pair causes a reverse current and a hold current as suppression currents that suppress the reverse transport amount of the feed roller to the reverse transport amount of the transport roller pair or less to flow to the first motor in at least a part of the skew removal operation.